cost.py now pep8-clean. Told .gitignore to ignore meld backup files (.orig) and pylintrc
fixed bug introduced in mlp.py when pep8-cleaning
restored pep8-cleanness of mlp.py
Merge pull request #550 from SuperElectric/pep8_fixes

Fixed bug introduced by pep8-cleaning of mlp.py
added import warnings
Merge remote-tracking branch 'upstream/master' into no_crossentropy_class